A-7
OHMS (cont’d)
2-WIRE RESISTANCE READING RATES
10,12
20
Ω
, 200
Ω
, 2k
Ω
, and 20k
Ω
Ranges
READINGS/SECOND WITH
MEASUREMENT DEFAULT READINGS/SECOND TO MEMORY READINGS/SECOND TO IEEE-488 TIME STAMP TO IEEE-488
NPLC APERTURE BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On
10 167 ms (200 ms) 28 7
1
⁄
2
6 (5.1) 2 (1.7) 5 (4) 2 (1.6) 5 (4) 2 (1.6)
2 33.4 ms (40 ms) 26 7
1
⁄
2
30 (25) 8 (7.1) 28 (23) 8 (6.8) 27 (22) 8 (6.7)
1 16.7 ms (20 ms) 25 6
1
⁄
2
58 (48) 40 (34) 53 (45) 37 (32) 49 (41) 35 (31)
0.2
11
3.34 ms (4 ms) 22 6
1
⁄
2
219 (189) 109 (97) 197 (162) 97 (87) 140 (129) 79 (74)
0.1
11
1.67 ms (2 ms) 21 5
1
⁄
2
300 (300) 126 (118) 248 (245) 112 (108) 164 (163) 89 (88)
0.02
11
334
µ
s (400
µ
s) 19 5
1
⁄
2
300 (300) 130 (130) 249 (249) 114 (114) 165 (165) 91 (91)
0.01
11
167
µ
s (167
µ
s) 16 4
1
⁄
2
421 (421) 135 (135) 306 (306) 114 (114) 189 (189) 92 (92)
0.01
8,11
167
µ
s (167
µ
s) 16 4
1
⁄
2
2000 (2000) 2000(2000)
2-WIRE RESISTANCE READING RATES
10,12
20M
Ω
Range
READINGS/SECOND WITH
MEASUREMENT DEFAULT READINGS/SECOND TO MEMORY TIME STAMP TO IEEE-488
NPLC APERTURE BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On
10 167 ms (200 ms) 28 7
1
⁄
2
6 (5.1) 1 (0.8) 2 (1.8) 1 (0.8)
2 33.4 ms (40 ms) 26 7
1
⁄
2
30 (25) 1 (0.8) 16(14.5) 1 (0.8)
1 16.7 ms (20 ms) 25 6
1
⁄
2
58 (48) 4 (3.8) 25 (22) 4 (3.5)
0.1
11
1.67 ms (2 ms) 21 5
1
⁄
2
300 (296) 5 (5) 43 (39) 5 (4.7)
0.02
11
334
µ
s (400
µ
s) 19 5
1
⁄
2
300 (300) 5 (5) 43 (43) 5 (5)
0.01
11
167
µ
s (167
µ
s) 16 4
1
⁄
2
412 (412) 5 (5) 43 (43) 5 (5)
4-WIRE RESISTANCE READING RATES
10,12
Any Range
READINGS or READINGS WITH TIME STAMP/SECOND
MEASUREMENT DEFAULT TO MEMORY or IEEE-488, AUTO ZERO ON
NPLC APERTURE BITS DIGITS Offset Comp. Off Offset Comp. On
10 167 ms (200 ms) 28 7
1
⁄
2
2 (1.6) 0.6 (0.5)
2 33.4 ms (40 ms) 26 7
1
⁄
2
7 (6.1) 2 (1.6)
1 16.7 ms (20 ms) 25 6
1
⁄
2
12 (11.6) 3 (3.7)
0.1
11
1.67 ms (2 ms) 21 5
1
⁄
2
20 (20) 6 (6)
0.01
11
167
µ
s (167
µ
s) 16 4
1
⁄
2
21 (21) 7 (7)
OHMS NOTES
1. Current source is typically
±
9% absolute accuracy.
2. Total of measured value and lead resistance cannot exceed full scale.
3. Maximum offset compensation plus source current times measured resistance must be less
than source current times resistance range selected.
4. For 2-wire mode.
5. Specifications are for 1 power line cycle, 10 reading digital filter, Auto Zero on, 4-wire
mode, offset compensation on (for 20
Ω
to 20k
Ω
ranges).
6. For TCAL
±
1
°
C, following 55 minute warm-up. TCAL is ambient temperature at calibration
(23
°
C at the factory).
7. For TCAL
±
5
°
C, following 55-minute warm-up. Specifications include traceability to US
NIST.
8. In burst mode, display off. Burst mode requires Auto Zero refresh (by changing resolution
or measurement function) once every 24 hours.
9. For TCAL
±
5
°
C, 90-day accuracy. 1-year and 2-year accuracy can be found by applying the
same speed accuracy ppm changes to the 1-year or 2-year base accuracy.
10.For DELAY=0, digital filter off, internal trigger, display off. Aperture is reciprocal of line
frequency. These rates are for 60Hz and (50Hz). Speed for 200k
Ω
range is typically 10%
slower than 20k
Ω
range; speed for 2M
Ω
range is typically 3 times faster than 20M
Ω
range;
speed for 1G
Ω
range is typically 30%–50% as fast as 20M
Ω
range. See Operating Speed
section for additional detail.
11.Ohms measurements at rates lower than 1 power line cycle are subject to potential noise
pickup. Care must be taken to provide adequate shielding.
12.Typical values.
DC AMPS
DCI INPUT CHARACTERISTICS AND ACCURACY
4
MAXIMUM ACCURACY
1
TEMPERATURE COEFFICIENT
FULL DEFAULT BURDEN
±
(ppm of reading + ppm of range)
±
(ppm of reading + ppm of range)/
°
C
RANGE SCALE RESOLUTION RESOLUTION VOLTAGE
6
24 Hours
2
90 Days
3
1 Year
3
2 Years
3
Outside T
CAL
±
5
°
C
200
µ
A 210.00000 10 pA 100 pA 0.25 V 63 + 25 300 + 25 500 + 25 1350 + 25 58 + 7
2 mA 2.1000000 100 pA 1 nA 0.31 V 64 + 20 300 + 20 400 + 20 750 + 20 58 + 5
20 mA 21.000000 1 nA 10 nA 0.4 V 65 + 20 300 + 20 400 + 20 750 + 20 58 + 5
200 mA 210.00000 10 nA 100 nA 0.5 V 96 + 20 300 + 20 500 + 20 750 + 20 58 + 5
2 A 2.1000000 100 nA 1
µ
A 1.5 V 500 + 20 600 + 20 900 + 20 1350 + 20 58 + 5
DC CURRENT UNCERTAINTY =
±
[ (ppm reading)×(measured value) + (ppm of range)×(range used)] / 1,000,000.
% ACCURACY = (ppm accuracy) / 10,000.
10PPM OF RANGE = 20 counts at 6
1
⁄
2
digits.
DCI READING RATES
5,9
READINGS/SECOND WITH
MEASUREMENT DEFAULT READINGS/SECOND TO MEMORY READINGS/SECOND TO IEEE-488 TIME STAMP TO IEEE-488
NPLC APERTURE BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On
10 167 ms (200 ms) 28 7
1
⁄
2
6 (5.1) 2 (1.7) 6 (4.8) 2 (1.6) 6 (4.8) 2 (1.6)
2 33.4 ms (40 ms) 26 7
1
⁄
2
30 (24) 10 (8.2) 28 (23) 9 (7.8) 27 (22) 9 (7.7)
1 16.7 ms (20 ms) 25 6
1
⁄
2
57 (48) 45 (38) 53 (45) 41 (35) 48 (41) 40 (32)
0.2 3.34 ms (4 ms) 22 6
1
⁄
2
217 (195) 122 (111) 186 (168) 109 (98) 135 (125) 88 (85)
0.1 1.67 ms (2 ms) 21 5
1
⁄
2
279 (279) 144 (144) 234 (229) 123 (123) 158 (156) 99 (98)
0.02 334
µ
s (400
µ
s) 19 5
1
⁄
2
279 (279) 148 (148) 234 (234) 130 (130) 158 (158) 101 (101)
0.01 167
µ
s (167
µ
s) 16 4
1
⁄
2
298 (298) 150 (150) 245 (245) 132 (132) 164 (164) 102 (102)
0.01
7
167
µ
s (167
µ
s) 16 4
1
⁄
2
2000 (2000) 2000 (2000)
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